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Datafile extend or add new file

I am a new oracle dba. I am concerned that one of the files is getting low on space. Running oracle 8i on AIX. Does the file automatically extend or does it create a new file? I think I have to create a new file, just not sure.

Check how was it created, meaning, if autoextend is allowed for it.
Either way, I do prefer to control my tablespaces myself so I used (Ora8i) to create datafiles with autoextend set to OFF then add datafiles as needed.

Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.

If you want to learn, then you should write a query to join these views and figure out how much
free space you have in each tablespace. You should join the two tables with tablespace_name
and file_id. Now you can make the query work for what you are looking for. This is 11g, your
version of Oracle is different.

By the way if you are learning Oracle why start with a 10+ year old version of Oracle?